Welding jig



Feb. 13, 1923.

0. MULLER, JR.

WELDING HG.

man SEPT. Le, 1919.

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mill-Ml Affy. l

Patented Feb. 13, 1923.

UNITED. STATES l Y 1,445,231 PATENT oFFlcE.

OTTO MULLER, JB., 0F BIDGEWOOD, NEW YORK, ASSIGNOB T0 WESTERN ILEC'IBC OOIPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

WELDING ne.

Application illed September 19, 1919. Serial No. 824,057.

To all whom it may concern:

Be it known that I, OTTO MULLER, JR., a citizen of the United States, residing at Rid ewood, in the county of Queens, tate of ew York, have invented certain new and useful Improvements in Welding Jigs, of which the following is a full, clear, concise, and exact description.

This invention relates to welding jigs, and more particularly it relates to welding jigs for vacuum tube electrodes.

In the manufacture of vacuum tubes, particularly of the type wherein a plurality of electrodes are employed, it is essential that the space relation of the electrodes be made the same in all tubes of a similar type iny order that their operating characteristics will be identical.

In its specific aspect this invention is described in connection with a vacuum tube electrode that comprises two plates which are to be spaced with respect to each other by connecting wires of suitable length welded to each plate. In order that these plates may be spaced and aligned properly, they are placed in a welding jig while the connecting wires are being welded thereto.l This jig comprises a block against two parallel sides of which the two plates may be placed. Hinged to one end of the block are two arms which are adapted to be clamped i tightly'against the block to hold the plates in place. It is preferable that the width of the surfaces of the sides against which the plates are pressed .be the same as the width of the plates. Lugs may then be provided on the two arms projecting inwardly towards the block, spaced vso as to just allow the block to pass between the lugs, thereby preventing any lateral motion of the two plates. It is also preferable that the jig be made of some conducting material, such as copper, so that the jig may be employed as a part of one of the electrodes of the welding machine. The jig with the two plates clamped in place may then be placed on the base plate which forms one of the electrodes of a welding machine and the above described connecting wires welded to the plates in any suitable manner.

This invention will be better understood by reference to Athe following detailed de-A scription takenv in connectionwith the ac- -plate 7 which together with the jig forms one of the electrodes of the welding maf chine. The other electrode 8 of the machine is attached to a movable arm 9 so that lthe electrode 8 may be placed in contact with the part to be welded on the article held by 31g 6. Current for these electrodes may be supplied by means of leads 12 and 13.

The welding jig 6 is shown in detail inl F ig. 2, in which 14 is a metallic block havlng two plane parallel sides of substantially the same width as theplates to be held by the jig and of a thickness equal to the distance desired between the two plates ofthe vacuum tube electrode. Hinged at the one end of block 14 are two arms 15 and 16. Arm 15 has a raised plane surface 17 of substantially the same width as the width of the plate to be held by the jig. Near the upper edge of armi15 are two inwardly projectlng lugs-18 .and,19; near the lower edge are two j' corresponding inwardly projecting lugs 20 and 21. The distance between lugs 18, 19 and lugs 20, 21 should be just slightly greater vthan the width of plate 22, which is to be held between block 14 andthe plane surface 17 of arm 15. The specific form of plate shown in Fig. 2 has upturned edges 24 and 25, which are adapted to fit snugl over the edges of the projecting surface 1 of. arm 15. v

Arm 16 is similar to arm 15 in that it has a raised plane surface corresponding to the surface 17 of arm 15. and has lugs in its upper and lower edges for preventing any lateral motion of the plate held between arm 16 and block 14. Only two of the lugs 27 an'd 28 are shown in the figure. 29 is one of the upturned edges of the plate which is held between arm 16 and block 14. With the twol plates in position between the arms and the block, the arms may be clamped tightly a ainst the plates by means of member 30 w ich has a slot 31 adapted to engage inion 32 in arm 15. Block 14 Yis slotte at 33 to receive the member 30, thereby preventin y any lateral motion of block `14 between't e arms 15'and 16. The connecting wires 34: and 35, which are employed to make a unitary structure of the plates 22 and 36, may then be ut in position with their ends restin on t e upturned edges of the two plates. or convemence, it 's (preferable that the width of plates 15: an 16 be greater than the widthof block 14 so'that when the jig is placed on the base plate 7 in the position shown in Ei 1, no part of the vacuum tube electr e comprising the two plates and their connectlng wires comes in contact with the base. Fig. 3l shows .a completed unitary double plate electrode after the plates 22 and 36 have been secured together by welding the connectingvwiresfthereto'. Q v

Fig. 4 shows the doble plate electrode incorporated as the anode of a vacuum tube 38 of the three-electrode type.

It is to be understood thatthis invention is 'not limitedto the particular form disclosed above and that it may be variously modified without departing in anywise from the spirit of this invention asdeined in the ap nded claims. v

at is claimed is: f

1. A welding ji v block, a plurality 0% metallic arms hinged to said block, and means for clamping said arms against said block. 2. A welding jig comprising a metallic block, two metallic arms hingedv to said blockat one end thereof, and means for clampin said arms in close face-to-face relation with opposite sides of said block.

3. A welding jig-.comprisin block having two extensive p ane parallel surfaces'on opposite sides thereof, two metallic arms hinged to said'block at one end,

' hin each ofsaid arms having'l an extensive plane surface, and means at t e end opposite the connection. for clamplng vsaid arms against said block whereby the plane sur- 'faces of said arms 'and said block are placed in close face-to-face relation with each other.

4. A welding jig comprising ametallic block, two metallic arms hin ed tol said block' at one end thereof, means or'clampng said arms in close face-to-face relation with opposite sidesv of said block, and a plurality oflu near two edges of each of said arms,

said ugs projecting beyond the sides of' 4said arms adjacent saidblock, the distance comprisingv a metallic a metallic `Luana:

5. A jig for welding a two-part article, I

said jig comprisin a metallic block, two arms hnged to' said block, and means for clamping one part of said article between one of said arms and said block, and'for clamping the other part of said'article l,between the other arm and said block.

6. A jig for welding a two-part article, said comprising a metallic block, two metal- 1c arms hmged to said block at one end.

thereof, said block` having two extensive plane parallelv surfaces on opposite sides thereof, each ofsaid arms having a projectmg fiat surface, and means for clamping sald larms adainst said' block whereby the two parts ofB said article are held between the flat surfaces of said arms and said block.

7; A ji for welding an article which has two simi ar metallic bloc twov arms hinged to said block, said' block having two extensive plane parallel surfaces on opposite sides thereof, each of said arms having an exten- `siivelat surface, means for clamping one of parts, said jig lcomprising av said parts between one of said arms and said block and lfor clamping said other part between said other arm andl said block, one dimension of the fiat surface of said block and one dimension of the at surface of said arm being substantially the same as a dimension lof the two parts of said article, and means comprising lugs on said arms for preventing lateral motion of the two parts of said article.

8. A ji for an article of a plurality of parts an adapted to complete the electric circuit between welding electrodes, said jig comprising movable members for holdingl therebetween the parts of the article to be welded.

9. A jig for an article of a' plurality of 'p arts and adapted to complete the electric clrcultbetween welding electrodes, said jig vcomprising a metallic block and movable oTTo MULLER, JR. Y 

